# Full text of "The Flow Of Gases In Furnaces"

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APPENDIX VIII

TABLE 4—Continued

Blast
Air Supply for Combustion of Gas

40 Per Cent
Excess
80 Per Cent Excess

Volumes at 0° 760 mm per second ......
16 m3 78 8m3 39 650° 70° 360° 4-580° 2.32
2m3 26
1220° 280° 750° -940° 3.75 95.0 2 m3 15 182.0 4m3 31
16 m3 16
5.42 3.45 11.00 19.87
47.3° 85.5° 2m 182
1950 375 1575 1595
2m3 26
1220° 280° 750° -940° 3.75 123.0 2m8 78 210.0 4m8 75
17 m8 81
4.94 2.21 9.98 17.13
54.9° 94.2° 2m 405
2220 433
1787
1809 18,232,000

0° 1 atmosphere

Temperatures, maximum                       . .

Minimum ........        ........

Average

Change

Gas factors for average temperature . .   .

Air supply, per cent of gas volume ......

Volume 0° -760 mm ............. ...

Products of combustion per cent gas

Volume 0° —760 mm ..............

Volumes   at   average  temperature  and pressure ..........        .   .
19 m3 46
4.50 2.02 9.14 15.66
37.1° 63.5° 2m 626

Time, average, in seconds to pass through Combustion chamber  .

Dome .....................

Checker .........................

Total ......

Temperature change, average per second Based on total volume ..........

Based on checker only

Velocity, average in checker

Heat capacities per 100 molecular volumes from Curves.    Calories Gases at 1220° ........

Blast at 650° ..............
465

Gases at 280° ..................

Blast at 70° ..........    •
50 415

Difference ......

Calories released or absorbed per second (2. 26X44. SO -^ 100) X 1575 = ....

1787= ........

(16. 78X44. 80- 100) X 415=.
3120 11,232,000
16,078,000

Calories absorbed in one hour on blast = 3120X3600= .........

Calories released from gases in 2 . 8 hour = 10,080 seconds 1575X10.080=... .

1809X10,080=...

Assuming specific heat of brick =0.250 at 1 ° change in its temperature will = ___ 400,800X0.250 = 100,200 calories

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